Radar system having interference rejection
AssigneeRaytheon Company
InventorsWilliam M. Pease, Bernard Bussiere, Carl E. Battles
Life of this patent
Estimating the term…
Abstract
A radar system with digitized video having a digital interference rejection circuit for eliminating spiral interference caused by nearby radar transmitters operating in the same frequency band. Video signals from each sweep are stored in a random access memory. A comparison is made between adjacent range cells in the present "live" video signal and the video signal from the previous sweep. The output video signal to the display device is inhibited should the comparison indicate the presence of interference.
Claims10
In combination:
- first means for storing digital representations of a radar return signal;
- means for reading said representations out of said storing means, the time period for reading said representations out of said storing means being greater than the time period for reading said representations into said storing means for at least some settings of a radar range scale setting;
- means for producing a video signal in response to representations read out from said storing means;
- and
- means coupled to said storing means for eliminating interference in said video signal.
Apparatus for eliminating interference in a PPI radar system caused by signals received directly from other radar transmitters operating in the same frequency band as said radar system comprising in combination:
- means for storing at least portions of digital representations of a radar return signal;
- means for reading said representations out of said storing means, the time period for reading said representations out of said storing means being greater than the time period for reading said representations into said storing means for at least some settings of a radar range scale setting;
- means for comparing outputs from said storing means with at least portions of input digital representations of said radar return signal;
- means for producing a video signal in response to said input digital representations;
- and
- means for inhibiting said video signal in response to said comparing means.
Dependencies are inferred from the claim text.